Definition that contains clide
- riemann pioneer of non-Euclidean geometry (1826-1866)
- hyperbolic geometry (mathematics) a non-Euclidean geometry in which the parallel axiom is replaced by the assumption that through any point in a plane there are two or more lines that do not intersect a given line in the plane
- euclid's postulate (mathematics) any of five axioms that are generally recognized as the basis for Euclidean geometry
- nikolai ivanovich lobachevsky Russian mathematician who independently discovered non-Euclidean geometry (1792-1856)
- bernhard riemann pioneer of non-Euclidean geometry (1826-1866)
- euclidean axiom (mathematics) any of five axioms that are generally recognized as the basis for Euclidean geometry
- riemannian of or relating to Riemann's non-Euclidean geometry
- elliptic geometry (mathematics) a non-Euclidean geometry that regards space as like a sphere and a line as like a great circle
- georg friedrich bernhard riemann pioneer of non-Euclidean geometry (1826-1866)
- lobachevsky Russian mathematician who independently discovered non-Euclidean geometry (1792-1856)